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# Topic: International System of Units

###### In the News (Mon 20 May 13)

 The International System of Units, by Robert A. Nelson In Paris the unit of length was the Pied de Roi and the unit of mass was the Livre poids de marc. The unit of volume, the pinte (later renamed the litre), was defined as the volume of a cube having a side equal to one-tenth of a meter. The unit of mass, the grave (later renamed the kilogramme), was defined as the mass of one pinte of distilled water at the temperature of melting ice. www.aticourses.com /international_system_units.htm   (6282 words)

 International System of Units - Wikipedia, the free encyclopedia The International System of Units (abbreviated SI from the French language name Système international d'unités) is the modern form of the metric system. The metric system was conceived by a group of scientists (among them, Lavoisier) which had been commissioned by king Louis XVI of France to create a unified and rational system of measures. Since most non-SI units in common use, such as the U.S. customary units, are nowadays defined in terms of SI units, any change in the definition of the SI units results in a change of the definition of the older units as well. en.wikipedia.org /wiki/International_System_of_Units   (1800 words)

 Encyclopedia :: encyclopedia : SI   (Site not responding. Last check: ) The International System of Units (abbreviated SI from the French phrase, Système International d'Unités) is the most widely used system of units. The swift worldwide adoption of the metric system as a tool of economy and everyday commerce was based mainly on the lack of customary systems in many countries to adequately describe some concepts, or as a result of an attempt to standardize the many regional variations in the customary system. The presence of these adjustments has been one reason advocates of the U.S. customary units had used against metrication; these customary units, however, are nowadays defined in terms of SI units, thus any difference in the definition of the SI units results in a difference of the definition of the customary units. www.hallencyclopedia.com /SI   (1613 words)

 Units: The International System For example, the SI unit of force, the newton, is defined to be the force that accelerates a mass of one kilogram at the rate of one meter per second per second. units for measurement of magnetism: the weber (flux), tesla (flux density), and henry (inductance); These units are supposed to be "defined in relation to the SI in every document in which they are used," and "their use is not encouraged." These barely-tolerated units might well be prohibited by future meetings of the CGPM. www.unc.edu /~rowlett/units/sipm.html   (1012 words)

 International System The meter is the fundamental unit of length in the International System of Units. Like the international prototype meter (which was constructed at the same time) access to the international prototype kilogram is strictly controlled to reduce wear and tear on it from normal use and to prevent its accidental or intentional destruction. The kilogram is the unit of mass; it is equal to the mass of the international prototype of the kilogram. hypertextbook.com /physics/foundations/system-international/index.shtml   (2756 words)

 Intute sciences - Chemical Sciences: Introduction: The International System of Units The SI unit of length is the metre or meter, a fundamental unit of the SI. The SI unit of mass is the kilogram, a fundamental unit of the SI. The SI unit of temperature is the kelvin, a fundamental unit of the SI. www.intute.ac.uk /sciences/reference/plambeck/chem1/p01016.htm   (1403 words)

 BookRags: International System of Units Summary Simple units, such as the cubit which is the distance between a man's elbow and the tip of his middle finger, or the span, the distance from the tip of the thumb to the tip of the little finger of an outstretched hand, were used for much of recorded history. They developed a system based on objects or phenomena that could be measured reproducibly; these natural measurements were independent of man. For instance, the meter (Greek for "to measure"), the basic unit of length, was calculated to be 1/10,000,000 of the distance between the North Pole and the equator on a line running through Paris. For example, the liter (a derived unit of volume) is the volume occupied by one cubic decimeter, while the kilogram (the basic unit of mass) is the mass of a liter of water at 4°C. Smaller and larger units were available by multiplying and dividing by powers of ten. www.bookrags.com /research/international-system-of-units-woc   (1155 words)

 SI System of units International System of Units also called SI System, French Système International D'unités, international decimal system of weights and measures derived from and extending the metric system of units. Rapid advances in science and technology in the 19th and 20th centuries fostered the development of several overlapping systems of units of measurements as scientists improvised to meet the practical needs of their disciplines. The early international system devised to rectify this situation was called the metre-kilogram-second (MKS) system. www.ldeo.columbia.edu /~martins/eda/SI_System_of_units.html   (188 words)

 What is International System of Units? - a definition from Whatis.com - see also: SI The meter (abbreviation, m) is the SI unit of displacement or length. The kilogram (abbreviation, kg) is the SI unit of mass. SI derived units include the hertz, the newton, the pascal (unit of pressure or stress), the ohm, the farad, the joule, the coulomb, the tesla, the lumen, the becquerel, the whatis.techtarget.com /definition/0,,sid9_gci523539,00.html   (550 words)

 International System of Electrical and Magnetic Units A “practical” system is one whose units have magnitudes convenient for the purposes for which they are used, which often leads to their being much bigger than the absolute units on which they are ultimately based. The International System was, nonetheless, a new system. The International System was modified by the London Electrical Conference in 1908, and discarded by the CGPM in 1948. www.sizes.com /units/int_ENMsys.htm   (383 words)

 International System of units and principal conversions unit of measure International System of units and principal conversions unit of measure All it is born from the requirement to use common units of measure for the quantification and the measure of the physical quantity, for favor the commercial exchanges and the scientific studies, between persons of the same, or different nation. In the course of the years they have been inserted other fundamental units, until arriving to the 7 fundamental quantity, with the 2 additional units currently in use in International System, multiple and the decimal submultiples, and the other derived units. www.themeter.net /principale_e.htm   (273 words)

 base and derived units of the international system it is equal to the mass of the international prototype of the kilogram The kelvin, unit of thermodynamic temperature, is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water. the unit of atomic mass is equal to 1/12 of the mass of an atom of the nuclide 12C members.tripod.com /units_of_measure/un-fon_e.htm   (564 words)

 BIPM - SI The 11th General Conference on Weights and Measures (1960) adopted the name Système International d'Unités (International System of Units, international abbreviation SI), for the recommended practical system of units of measurement. The base units are a choice of seven well-defined units which by convention are regarded as dimensionally independent: the metre, the kilogram, the second, the ampere, the kelvin, the mole, and the candela. The names and symbols of some of the units thus formed can be replaced by special names and symbols which can themselves be used to form expressions and symbols of other derived units. www.bipm.org /en/si   (187 words)

 International System of Units Supplementary units in SI This class of units (but not the radian and steradian themselves!) was abolished in 1995. Giorgi originally suggested that the electric unit be a unit of resistance, but later that was replaced by a unit of current, the ampere. The great advantage of Giorgi's proposal was that it used familiar units of mass, length, and time and, with rationalized units (and the right choice of a value for the permeability of free space), it preserved the sizes of the practical electric units, even though they were defined in absolute rather than material terms. www.sizes.com /units/SI.htm   (907 words)

 International System of Units The metric system was established officially in France on June 22, 1799, and consisted of two standard measures: the meter for length and the kilogram for mass. In 1960 the eleventh CGPM renamed its MKS system of units the International System of Units, and in 1971 the fourteenth CGPM completed the seven-unit system in use today, with the addition of the mole as the unit for the amount of a substance, setting it equal to the gram-molecular weight of a substance. To use prefixes with a unit for mass, the rule is to remove the "kilo"; prefix and add the new prefix to "gram" (unit symbol g), as in milligram and its abbreviation mg. www.chemistryexplained.com /Hy-Kr/International-System-of-Units.html   (1357 words)

 The International System of Units Kilogram: The kilogram is the unit of mass equal to the mass of the international prototype of kilogram. Kelvin: The kelvin, unit of thermodynamic temperature is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water. Candela: The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540x1012 Hz and that has a radiant intensity in that direction of 1/683 watt per steradian. www.members.optusnet.com.au /ncrick/converters/SI_units.html   (357 words)

 Units of the International System The key features of the International System are decimalization, system of prefixes and a standard defined in terms of an invariable physical measure. The International System uses two supplementary units that are based on abstract geometrical concepts rather than physical standards. Most of the units in the International System are a derived unit, that is units defined in terms of base units and supplementary units. www.visusa.com /unitsint.htm   (282 words)

 Metric System The International System of Units, abbreviated SI (for the French name Système International d'Unités), is the most widely used system of units. The metric system can legally be used in every country in the world (including the United States), and in many countries its use is obligatory. The International System of Units was adopted by the 11th General Conference on Weights and Measures (CGPM) in 1960 and is built on the seven SI base units, which are used to define various SI derived units. www.metric-conversion-tables.com /metricsystem.htm   (189 words)

 The International System of Units (SI) This system was internationally ratified by the Metre Convention on 10 May 1875, which set up the Bureau International des Poids et Mesures (BIPM). Lastly, during the eleventh Conférence Générale des Poids et Mesures in 1960, the International System of Units (SI) was developed. The derived units are complementary to the base units. www.lne.fr /metrologie_francaise/version_anglaise/pages/measurement/unites.htm   (498 words)

 Units of Measurement - An Overview The International System of Units, universally abbreviated SI (from the French Le Systeme International d’Unites), is the modern metric system of measurement. The International System was established by the 11th General Conference on Weights and Measures (CGPM, Conference Generale des Poids et Mesures) in 1960, and it is the responsibility of the CGPM to ensure that the SI is widely disseminated and that it reflects the latest advances in science and technology [1]. Nowadays, a foot is considered to be 0.3048 meter, where the meter is the fundamental unit of displacement in the metric system and Standard International (SI) System of Units. www.knowbotron.com /dicom/help/article/umo_intro.htm   (811 words)

 International System of Units As said above, mass is unique amongst the base quantities of the SI because its unit definition, the kilogram, is based on a physical artefact; a cylinder of platinum iridium alloy, held at the Bureau International des Poids et Mesures BIPM near Paris, is defined as being exactly one kilogram in mass. All mass measurements undertaken in the World should be traceable to this single artefact - the international prototype of the kilogram (known as K - see history of the kilogram) - and this is achieved by regularly comparing its mass with the official 'copies' of the Kilogram held in national measurement institutes, such as NPL. The United Kingdom's national standard of mass - known as Kilogram 18 - is held at NPL and is the basis of the mass scale, or traceability hierarchy, in the UK. www.npl.co.uk /mass/faqs/si.html   (519 words)

 The International System of Units The International System of Units(SI), uses a single basic unit for each physical quantity, and multiples and fractions of this unit are formed by adding a prefix. For example, the SI unit for length is the meter (m). Thus, the symbol for the meter is m, whereas the symbol for the Newton is N. teacher.nsrl.rochester.edu /phy_labs/AppendixA/AppendixA.html   (183 words)

 Definition: international system of units International System of Units (SI): The modern form of the metric system, which has been adopted by the United States and most other nations. Derived units are formed by combining base units and other derived units according to the algebraic relations linking the corresponding quantities. The symbols for derived units are obtained by means of the mathematical signs for multiplication, division, and use of exponents. www.its.bldrdoc.gov /fs-1037/dir-019/_2826.htm   (161 words)

 Intute sciences - Chemical Sciences: International System of Units; Derived Units Both the pound-force and the kilogram-force are units which depend upon the force of terrestrial gravitation; the value of the kilogram-force is defined in terms of the standard terrestrial force of gravity. The only significant unit of power used prior to the SI in English-speaking countries was the mechanical horsepower, defined as equal to 550 foot-pounds per second; 1 mechanical horsepower (hp) = 745.700 W. Other horsepower units used were not exact equivalents. The SI unit of electrical potential or electrical potential difference, sometimes also known as the unit of electromotive force, is the volt. www.intute.ac.uk /sciences/reference/plambeck/chem1/p01016a.htm   (1187 words)

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